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Title:
HIGH STRENGTH GALVANIZED STEEL SHEET AND PRODUCTION METHOD THEREFOR
Document Type and Number:
Japanese Patent JP2002256386
Kind Code:
A
Abstract:

To provide a high strength galvanized steel sheet which is not fractured in the HAZ(heat affected zone) of the weld zone on forming and has formability similar to that of a single sheet.

The high strength galvanized steel sheet contains, as chemical components, 0.04 to 0.25% C, ≤0.7% Si, 1.4 to 3.5% Mn, 0.05 to 1% Cr, ≤0.05% P, ≤0.01% S and 0.005 to 0.1% Nb and the balance substantially iron. The steel sheet also has a composite structure consisting of ferrite and a low temperature transformation phase having a mean grain size of ≤10 μm. The steel sheet can contain one or more elements selected from 0.05 to 1% Mo, 0.02 to 0.5% V, 0.005 to 0.05% Ti and 0.0002 to 0.002% B as well.


Inventors:
NAGATAKI YASUNOBU
KITANO FUSAHITO
SATO KENTARO
IWABUCHI MASAHIRO
GAMA AKIRA
Application Number:
JP2001000051300
Publication Date:
September 11, 2002
Filing Date:
February 27, 2001
Export Citation:
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Assignee:
NIPPON KOKAN KK
International Classes:
C21D9/46; C21D8/02; C22C38/00; C22C38/02; C22C38/26; C22C38/38; C23C2/02; C23C2/06; C23C2/40; (IPC1-7): C22C38/00; C21D9/46; C22C38/38
Domestic Patent References:
JPH11343538A1999-12-14
JP2000282175A2000-10-10
JP2000109951A2000-04-18
Attorney, Agent or Firm:
中濱 泰光